Jameco Electronics 3000 User Manual
178
Rabbit 3000 Microprocessor
Table 12-19. Extended Register HDLC Mode (Ports E and F only)
Serial Port x Extended Register
(SEER)
(Address = 0xCD)
(SFER)
(Address = 0xDD)
Bit(s)
Value
Description (HDLC mode only)
7:5
000
NRZ data encoding for HDLC receiver and transmitter.
010
NRZI data encoding for HDLC receiver and transmitter.
100
Biphase-Level (Manchester) data encoding for HDLC receiver and transmitter.
110
Biphase-Space data encoding for HDLC receiver and transmitter.
111
Biphase-Mark data encoding for HDLC receiver and transmitter.
4
0
Normal HDLC data encoding.
1
Enable RZI coding (1/4th bit cell IRDA-compliant). This mode can only be used
with internal clock and NRZ data encoding.
with internal clock and NRZ data encoding.
3
0
Idle line condition is Flags.
1
Idle line condition is all ones.
2
0
Transmit Flag on underrun.
1
Transmit Abort on underrun.
1:0
xx
These bits are ignored in HDLC mode.